Workholder



June 30, 1925. 1,543,786

J. w. MURPHY WORKHOLDER 2 Sheets-Sheet 1 Filed March 28, 1923 Juhnwmur hINVENTOR W ATTORNEY June 30, 1925.

J. W. MURPHY WORKHOLDER Filed Ma h 28, 1923 2 Sheets-Sheet 2 17 .Jnhn W.hy

ATTORNEY Patented June 30, 1925.

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JOHN W. lace-Pity. or coanme, new roan, ASSIGNQB 'roconnms Grass mass,

or ooanrne, new "roan, n CORPORATION or new rear.

WORKHOLDER.

Application filed March 28, 1923. SeriaLNo. 628,309;

Toiall whom it may concern/.5 1

Be-it known that I, J GEN N. MURPHY, a citizen of the United States,residing at Corning, in the county of Steuben and State of New York,have invented new and usefulImprovements in lVorkholders, of which thefollowing is a specification.

This invention relates to means for, holding rough iron casting rigidlyon the spindles 0t multiple-tooled turret lathes, so that the :toolscarried by the turret of the lathe can be successively brought into useto finish the castingsfwithout the'operator being required to makealterations or adjustments to the castings during the finishingoperations. Forthe purpose of illustrating a specific embodiment of myinvention, I have chosen to show the same used in connection with thefinishing of the rough castings or" the lunged together halves of glassblowing molds, the inside contour of such castings being machined out bymeans of forming roughing and finishing tools, while the halves areclosed.

In the accompanying drawings Figure 1, is a side elevation of a portionoi a multiple-tooled turret lathe, showing the lathe spindle with thework fastened thereto by means of the holder forming the subject matterof this invention, and a portion of the tool-carrying turret, one of thetools being in engagement with the work to be finished; I

F ig. 2, is a view of the work-holder show ing only a portion of thelathe spindle, as seen from the arrow X, Fig. 1;

' Fig. 8, is a transverse section taken on the line 3-3 of Fig. 2; 1

Fig. 4, is a view oi the work-holder as seen from the arrow Y, Fig. 2;

Fig. 5, is a transverse section taken on the line 55of Fig. 4;, and

Fig. 6, is an end view 01": the work-holder.

Iron molds which are used for forming blown glass articles (whether suchmolds are used on glass blowing machines, or in hand shops) are composedof two parts or halves A, and a, that is to say, they are formed so asto open and shut. The two halves of the molds are held by a hinge pinwhich must be a certain distance from the center of the bored mold, soas to properly locate the mold on the blowing machine or glass-workersdummy, as the case may be.

The mold castings usually have their exterior surfaces shaped to conformsomewhat to their interior contour.

Referring now to the drawings, wherein is shown the casting of anelectric light bulb nold adapted to be used on glass blowing machines,the casting'which is to be finished on the lathe has an annular flange Bthat forms the top of the mold, a tapering portion C that forms the neckof the mold, and an outwardly flared portion F which terminates in anenlarged portion G. The tapering portion C of the casting has a bead Dformed thereon adjacent to the flange B, a groove E being formed betweenthe flange 3 and the bead D. Formed integral with each of tie halves ofthe casting are arms H (Figs. 2 and the extremities of which areprovidedwith tubular bosses K through which the hingepin of the mold is passed.V

ltcisto be noted that the castings above described only form the upperportion of the complete mold, and that attached to the enlarged portionG is a semi-spherically shaped mold bottom (not shown).

In the operation of finishing the molt. castings in the machine shop,the bosses K of the two halves of the mold are first bored, then thecastings are transferred to a multiple tooled turret lathe for machiningthe inside contour.

The means for holding the castings on the turret lathe comprises acircular plate 10 that is threaded to the end of the lathe spindle 11 asshown by Fig. 1. Formed integrally with the plate 10 but spacedtherefrom by means of a pair of webs 13, is a base 12 that is slightlygreater in size than the plate 10.

Formed in the base 12 and offset from its center a distance equal to thedistance be tween the center of the internal bore of the casting and thecenter of the bore in the bosses K through which is passed thehinge pinof the mold, is an aperture 14: (Fig. 2) having a diameter equal to thediameter of the hinge pin of the mold.

Carried on the side of the base 12 opposite the aperture 14, is aslotted plate 15 which is adapted to be locked in position by means of ascrew 16. The plate 15 is mounted on the face of the base 12 in offsetrelation to a line projected through the center of the aperture 14: andthe center of the plate 12. The inner surface of plate 15 is arcuatelyformed so as to snugly fit against the vertical edge of the fiange B ofthe castingwhen suchcasting is being positioned on the base 12. If anumber of similar castings are being finished consecutively, one settingof the plate 15 is sufficient, as the purpose of this element is toassist in centering the castings on the base 12. j

The castings are designed to be held at right angles (90) to the face ofthe base 12 so that the longit'udinalaxis of the castings willcorrespond to the axis of the spindle of the lathe. For this purpose, Iprovide clamps 17 that are carried by. posts 18 extending from the base12 parallel to the axis of the spindle 11. The clamps 17 are so formedthat they can be used to press down on to the flange B of the castings,and such clamps are mounted for slidable movement on the posts 18.

The posts 18 have one of their ends passed through openings formed inthe base 12. These ends are threaded and nuts 19 are screwed tightagainst the underside of the base. The opposite or outer ends of theposts 18 are also threaded. Carried on the posts, between the clamps 17and the outerthreaded extremities of the posts area plurality of tubularspacers 20. These spacers are of varying lengths, and their purpose isto enable nuts 21: which are threaded on to the extremity of the posts,to be positioned away from the face of the base 12, whereby the operatorcan draw down on the nuts very tightly. The number of spacers 20 isdetermined by the thickness of the flange B of the castings, or thedistance of the clamps 17 from the base 12.

A block 22 (Fig. 6), which is supported by two posts 23 and 24projecting outwardly from the base 12, is provided with an aperture 25that is in line with the aperture 14: formed in the base.

Then the castings are being positioned on the base 12, a rod 26 having adiameter approximating the diameter of the hinge pin of the mold, ispassed through the aperture 25, then through the bosses K of thecastings and then through the aperture 14:. A groove is formed in thelower end of the rod 26 for the reception of a setscrew 27 that ismounted in the base 12 as shown by Figs. 2, 4t and 5. V

' For the purpose of holding the halves of the castings together, Iutilize a yoke 28 that is swingingly mounted on a post 29 extending fromthe base 12 diametrically opposite the aperture 1 1. The yoke is mounteda suitable distance from the base 12 and its arms carry set-screws 30that engage the side of the castings adjacent loosening one of theclamps 17 and the setscrews 30, and swinging the yoke out of the way.The reverse of this procedure puts the halves of the castings back inposition,'ready to go on with the machining.

By this device clamping and closing the halves of mold castingsas itdoes, any kind of castings of this general type with fixed distancebetween the longitudinal axis of the casting and the hinge pin thereof,can be held on a lathe to advantage, whereby tools of' very largecutting surfaces can be used to form the desired contour in the castingwithout clatter, or the castings being able to move in the holder.

Having thus described my invention what I claim and desire to secure byLetters Patent is 1. In a lathe work-holder for forming a central cavityin an article comprising separable hinged members, the combination of abase plate having a pin projecting therefrom adapted to pass throughthe. pivot holes of the separable members, clamping a base plate havinga pin projecting therefrom adapted to pass through the pivot holes ofthe separable members, clamping and centering means on the base platefor the base of the article, and a yoke 'pivotally mounted on the baseplate and having adjustable means to hold the upper portion of theseparable members together. 3. In a lathe-work holder for articleshaving hinged members in which a cavity is to be formed, the combinationof a base plate having clamping and centering means, a head framerigidly mounted thereon and spaced therefrom, and a rod having itsopposite ends supported in the plate and frame and having itsintermediate portion contained within the hinge of the article.

In testimony whereof I hereunto sign my name this 24th day of March,1923.

JOHN W. MURPHY.

